we want to visit the Blue Lagoon on the last day of our Iceland trip (16th of September). Our plan was to take a bus in Reykjavik in the morning and drive to the lagoon, spend the day there, and take another bus to the airport in the evening (around 21:00; our plane is leaving at midnight). Now I just found out, that there are less buses from the lagoon to the airport in September. The last departure time is 15:00 (I looked at the blue lagoon page http://www.bluelagoon.com and on this one www.re.is). Are there any other busses, that also drive in the evening to the airport? Or is our only alternative a taxi? If yes, how much would that cost?